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I don't think this is actually well documented anywhere... update = A field on the resource has been changed replace = We've deleted a resource and replaced it with a new one create-replacement = This is the create side of a replace, the replacement resource just created delete-replaced = This is the delete side of a replace, the original resource that's just been deleted

Awesome info, thank you! Suggestion (if you work for Pulumi): Add this to the documentation 😉

Tx! Added some more info in the ticket too.